Composition for acid-proof lining of digesters.



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ive. 744,689.

UNITED. STATES ROME DlUS PANZL, OF MUSKEGON, MICHIGAN.

Patented November 17, 1903.

PATENT V OFFICE.

COMPOSITION FOR ACID-PROOF LINING OF DIGESTERS.

PECIFIGATION forming part of Letters Patent N 0. 744,689, dated November 17, 1903.

Original application filed August 6, 1902, Serial No. 118,667. Divided and this application filed May 4, 1903. Serial To all whom it may concern:

Be it known that I, ROMEDIUS PANZL, of Muskegon, county of Muskegon, and State of Michigan, have invented certain new and useful improvements in compositions for acidproot linings of digesters and of other vessels and conduits used for storing, boiling, or conveying of corrosive liquids, of which the following is a specification.

The following is a full, clear, and exact specification of myinvention, which consists of the hereinafter-described composition of matter to be used in constructing linings for the interior of such vessels and conduits.

This invention relates more particularly to pulp-digesters, which are vessels used for pro.- paring pulp for paper-making. In these vessels the pulp is subjected to the action of corrosive liquids, which would rapidly destroy the iron shell of such digesters. It is therefore necessary to provide the interior of such digesters with lining that is impervious to and not aifected by such corrosive liquids. The digesting process requires also a high degree of heat and high pressure in the interior of the digester. The heat acting upon the metallic shell of the digester causes it to expand and to avoid cracking of the lining. Such lining material should also be to some extent yielding and expansible. Such material is set forth in my application for Letters Patent, filed August 6, 1902, Serial No. 118,667, of which this application is a subdivision. It is composed of calcined chamotte, slag, burnt cement, and coal-tar pu verized and in? e" '1' and then mam a plastic mass by adding thereto liquid silicate of soda. To protect such lining against abra- 810D, a superlining of tiles is made thereon after being thoroughly m m quantity (No specimens.)

of silicate of soda of from 30 to 45 Baum is added as1s required to produce a plastic mass of such consistency as ordinary mortarusod in plastering. The dry ingredients of the mortar may be mixed together in larger quantities; but the mixing thereof with the liquid silicate of soda must be done only in small terial of which the first layer of the lining is constructed and is absolutely impervious to and not aifected by any corrosive liquids.

When constructing the superlining of tiles, the mortar is applied on the back and all adjoining surfaces of the tiles. pressed hard in their places and care must be taken that any air-bubbles that may be caught between the tiles and the surfaces to which they are to be applied are expelled. It is preferable and advantageous to apply the first course of tiles before the layer of expansible lining material is hardened. This produces a better union of the mortar with the layer to be protected by the tiles. Therefore in practical application of my invention the lining of the digester is proceeded with in such manner that immediately after applying the layer of-the expansible lining material upon the shell the tiles are applied thereon, the work of lining of the digesters being proceeded with from the bottom outlet thereof successively toward the top. When more than one layer of such tiles is applied, the second and successive layers of such tiles are applied upon the preceding layers as the lining progresses from bottom toward the top of the digester. This, however, is not absolutely necessary, and the second and successive layers of the tiles may also be applied The tiles are after the first layer of tiles is completed or 0 claimed in my application for Letters Patent, l parts of chamotte, three parts of cement, and filed August 6, 1902, Serial No. 118,667, of of liquid silicate of soda. which this application is a subdivision. 1 T

Here I claim. as my invention ROMEDIUS PAL 1. An acid-proof mortar composed of chamotte, burnt cement and silicate of soda.

2. An acid-proof mortar composed of seven Witnesses:

W. S. HQRN, PAUL E, MEESKE. 

